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iTunes/Photos question when downgrading from Mojave(unsupported) to High Sierra

The.316

macrumors 65816
Original poster
Jul 14, 2010
1,334
138
25100 GR
Im having the same issue on my unsupported iMac running Mojave. I keep getting like a video card issue, where the screen flutters, restarts on its own, then gets stuck in the boot screen. The Apple logo will show, the status bar fills halfway, then disappears. It worked after a few restarts, but last night, it restarted on its own, and did the logo/status bar thing again. I think I just want to go back to High Sierra, which was working fine on my iMac.

The problem I have with doing this is that since iTunes and Photos were last saved on Mojave, I cannot load those files in High Sierra. Is there any way around that? Or am I stuck with having to re-install Mojave every few weeks?

And BTW...I cannot re-install without losing my data, there just doesnt seem to be that option anywhere.
 

Jack Neill

macrumors 65816
Sep 13, 2015
1,009
753
San Antonio Texas
Im having the same issue on my unsupported iMac running Mojave. I keep getting like a video card issue, where the screen flutters, restarts on its own, then gets stuck in the boot screen. The Apple logo will show, the status bar fills halfway, then disappears. It worked after a few restarts, but last night, it restarted on its own, and did the logo/status bar thing again. I think I just want to go back to High Sierra, which was working fine on my iMac.

The problem I have with doing this is that since iTunes and Photos were last saved on Mojave, I cannot load those files in High Sierra. Is there any way around that? Or am I stuck with having to re-install Mojave every few weeks?

And BTW...I cannot re-install without losing my data, there just doesnt seem to be that option anywhere.

Lessons learned is to always make a backup before a OS upgrade. If you use iTunes Cloud your library will repopulate after you log in on 10.13, For Photos you can export to another folder or drive and reimport after the 10.13 install OR you can try to start a new libary and import the Masters folder. You'll lose edits and albums wither way though.
 
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The.316

macrumors 65816
Original poster
Jul 14, 2010
1,334
138
25100 GR
Lessons learned is to always make a backup before a OS upgrade. If you use iTunes Cloud your library will repopulate after you log in on 10.13, For Photos you can export to another folder or drive and reimport after the 10.13 install OR you can try to start a new libary and import the Masters folder. You'll lose edits and albums wither way though.

If I reinstall Mojave, is there any way I can save my iTunes and Photos folder as an older Alias, that would be recognisable in High Sierra?
 
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Jack Neill

macrumors 65816
Sep 13, 2015
1,009
753
San Antonio Texas
If I reinstall Mojave, is there any way I can save my iTunes and Photos folder as an older Alias, that would be recognisable in High Sierra?

I don’t think so. Mojave and HS probably have the same iTunes version number right now, your iTunes will probably open in either version, your photos will not with rebuilding your library. Are you on Mohave or HS now?
 
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The.316

macrumors 65816
Original poster
Jul 14, 2010
1,334
138
25100 GR
I don’t think so. Mojave and HS probably have the same iTunes version number right now, your iTunes will probably open in either version, your photos will not with rebuilding your library. Are you on Mohave or HS now?

I reinstalled Mojave. I went through all the steps, the post install patch, then this happens on startup:

CCA41245-1A9D-42C4-B081-48BBE95361BC.jpeg
1D81BD97-3045-4236-B01E-D29D419CD87E.jpeg


Maybe I have a video card issue? Maybe that’s why this is happening.
 
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CaTOAGU

macrumors 6502a
Jul 15, 2008
724
743
Manchester, UK
For Photos, can you not use iCloud photos? So on your Mojave installation you'd enable iCloud Photos, wait to until all images/vidoes are synced. Then reinstall High Sierra as a clean install, create a new empty Photos library and enable iCloud Photos for that. In theory Photos should then download all your images from the cloud.
 
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NoBoMac

Moderator
Staff member
Jul 1, 2014
2,891
1,217
Wild guess, looks alot like a gpu issue.

Can you boot into recovery? If so, can copy off stuff and then try fixing from there (ie. Worst case, erase/reformat, reinstall).
 
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